Cathode mixture, all solid state battery, and method for producing cathode mixture

Abstract

An object of the present disclosure is to produce a cathode mixture with high capacity. The present disclosure achieves the object by providing a cathode mixture comprising: a cathode active material including a S element; a sulfur containing compound including an M element, which is Ge, Sn, Si, B or Al, and a S element; a conductive auxiliary material; and substantially no Li element.

What is claimed is: 
     
         1 . A cathode mixture comprising:
 a cathode active material including a S element;   a sulfur containing compound including an M element, which is Ge, Sn, Si, B or Al, and a S element;   a conductive auxiliary material; and   substantially no Li element.   
     
     
         2 . The cathode mixture according to  claim 1 , wherein a proportion of the Li element is 0 mol % or more and 20 mol % or less. 
     
     
         3 . The cathode mixture according to  claim 1 , wherein a carbon material is included as the conductive auxiliary material. 
     
     
         4 . An all solid state battery comprising a cathode layer, a solid electrolyte layer, and an anode layer in this order; wherein
 the cathode layer comprises a cathode active material including a S element, a sulfur containing compound including an M element, which is Ge, Sn, Si, B or Al, and a S element, a conductive auxiliary material, and substantially no Li element.   
     
     
         5 . A method for producing a cathode mixture, the method comprising steps of:
 a preparing step of preparing a raw material mixture containing a cathode active material including a S element, a sulfide including an M element, which is Ge, Sn, Si, B or Al, and a S element, a conductive auxiliary material, and substantially no Li element; and   a mechanical milling step of conducting mechanical milling to the raw material mixture.